Yeah the black gully climb.
Drop out of Dixons Hollow and take the switchbacks to the bottom fireroad. Turn right and follow it along until you get to a really bad cut up descent going off to your left. At the bottom of this, immediately turn right and head back up that gully climb which joins back onto the red just at the top.
Nice photos btw, and glad you enjoyed it.
On a further note, SingletrActionvolunteers are nearing completion of a really nice section of singletrack up at Crosscliffe which follows the side of the hillside and then will pop up somewhere near the black board section. For the eagle eyed amongst you, on the red section at White Cliffs, there is a preliminary mark out of a really nice technical black section, something which will be started on properly later this year (4foot rock drops with sweeping berms and possible slalomy/jumpy bits anyone?)